I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

What is the fastest way to double your money?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Can you write down eight eights so that they add up to one thousand?

When can we add 2 to 11 and get 1 as the correct answer?

What kind of storm is always in a rush?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

What will you call your mother's brother's brother-in-law?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10